nRF52840 Zephyr - External LTE-M modem, offloading and LwM2M

RE: nRF52840 Zephyr - External LTE-M modem, offloading and LwM2M

Martin Lesund — Fri, 09 Oct 2020 13:53:54 GMT

The Serial LTE modem source code is here.
no lwm2m support yet though.

RE: nRF52840 Zephyr - External LTE-M modem, offloading and LwM2M

newUser — Fri, 09 Oct 2020 13:38:04 GMT

Thank your for your reply Martin, but I meant the Socket Offloading code used in the nRF9160.

I would implement our modem the same way.

RE: nRF52840 Zephyr - External LTE-M modem, offloading and LwM2M

Martin Lesund — Fri, 09 Oct 2020 13:31:46 GMT

Here is the source code

RE: nRF52840 Zephyr - External LTE-M modem, offloading and LwM2M

newUser — Fri, 09 Oct 2020 13:00:37 GMT

But we do not have an nRF9160.

The LwM2M example you linked is the reason for this post. I want to be able to use that example code, so I need the incorporate a driver for our Quectel BG96 into the zephyr stack. Thus I'm asking if I should create an offloading driver, and how to do that. I know it is possible because the nRF9160 does it, but I couldn't find the source code.

RE: nRF52840 Zephyr - External LTE-M modem, offloading and LwM2M

Martin Lesund — Fri, 09 Oct 2020 12:08:45 GMT

Well, then connecting to the nrf9160 via some serial communication protocol and then forward the data to a leshan server should be possible.
You could use the Lwm2m client sample as reference.

RE: nRF52840 Zephyr - External LTE-M modem, offloading and LwM2M

newUser — Thu, 08 Oct 2020 14:15:19 GMT

Hi Martin, thank you for your response!

Sorry if I was not entirely clear, but we do not have an nRF91, only a custom nRF52840 board with an external LTE modem. We would like to send data to a remote LESHAN server.

RE: nRF52840 Zephyr - External LTE-M modem, offloading and LwM2M

Martin Lesund — Thu, 08 Oct 2020 14:13:21 GMT

Hi newUser,
What are you planning to send between the nrf52 and the nrf91?
You could e.g. run something like the Serial LTE modem application on the nRF91 and handle all the AT command communication on the nrf52 necessary for your functionality.
However it does not have all the features supported yet as you would if you run your application on the application side in the nrf91, using sockets etc.

So it depends a bit what you plan to use the nrf91 for and what you are going to send.
We can make this case private as well if there is sensitive information.